JP2023169783A - Power supply system, full load distribution board, power supply device, power supply control method for power supply device, power supply path, power conversion device, and connection method - Google Patents

Abstract

To provide a distributed power source and a power supply device that are connected to a commercial power system, and appropriately perform isolated operation during a power outage.SOLUTION: In a power supply system including a distributed power sources, a power supply device, and a full load distribution board, the full load distribution board includes a switch including a first input terminal into which power supplied from a commercial power system is input, a second input terminal into which an isolated operation output is input from the distributed power source, and an output terminal that outputs the power supplied to a load, a first electrical path connecting a system connection portion and the first input terminal, a first connection portion that is provided on the first electrical path and into which normal operation output is input from the distributed power source, a second connection portion that is provided between the first connection portion and the switch, and into which the normal operation output is input from the power supply device, a first current detector connected to the distributed power source to detect a current supplied to the first electrical path from the commercial power system, and a second current detector connected to the power supply device to detect the current flowing through the first electrical path connecting the first connection portion and the second connection portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power supply system, a full load distribution board, a power supply device, a power supply control method for a power supply device, a power supply path, a power conversion device, and a connection method.

Fuel cell cogeneration systems are increasingly being introduced because they can generate power regardless of the weather during power outages due to disasters, etc., and thermal energy can also be used for hot water supply, space heating, etc.

In addition, in the event of a power outage, the fuel cell cogeneration system and storage battery can be combined to discharge the storage battery in addition to the electricity generated by the fuel cell cogeneration system in order to use electrical products with higher power consumption. This is also being done. Further, as described in Patent Document 1, a power supply system including a full-load distribution board capable of supplying power not only to specific loads but also to general loads during a power outage has been proposed.

As a power supply system combining a fuel cell cogeneration system and a storage battery, a configuration as shown in FIG. 8 can be constructed. Power supply system 1000 shown in FIG. 8 includes a fuel cell cogeneration system 1006, a storage battery system 1005, and a solar power generation system 1004. When a new storage battery system 1005 is installed in a house equipped with a fuel cell cogeneration system 1006 and a solar power generation system 1004, the system configuration is as shown in FIG. In the power supply system 1000 shown in FIG. 8, a distribution board 1002 is installed on an electric line 1007 that supplies power from a commercial power system 1001 (actually connected via a power meter). A solar power generation system 1011 connected to the commercial power system 1001 is connected to the electric line 1007. A domestic load 1003 is connected to the distribution board 1002, and a fuel cell cogeneration system 1006 and a storage battery system 1005 are also connected thereto. The solar power generation system 1004 includes, for example, a PV panel and a power conditioner that controls the power generated by the PV panel and converts DC power output from the PV panel into AC power. The household fuel cell cogeneration system 1006 includes a hydrogen production device that produces hydrogen by reforming city gas, a fuel cell that generates electricity by reacting the hydrogen produced by the hydrogen production device with oxygen in the air, and a fuel It includes an inverter that converts DC power generated by batteries into AC power, a heat recovery device that heats water using the heat generated by power generation by fuel cells, and a hot water storage tank that stores heated hot water. The storage battery system 1005 includes a storage battery, a storage battery unit that controls charging and discharging of the storage battery, and a bidirectional A/R that converts AC power input to the storage battery into DC power and converts DC power output from the storage battery into AC power. It includes a power conditioner equipped with a D converter and a D/D converter that converts DC voltage. Note that the fuel cell cogeneration system 1006 and the power storage system 1005 are also equipped with a function to detect whether the commercial power system 1001 is normal or not and a function to detect a power outage. For example, a power conditioner device included in the system may include a detection function. There are various detection methods. The solar power generation system 1004 may be equipped with a function to detect whether the commercial power system 1001 is normal or a function to detect a power outage.

At this time, the output of the current transformer CT1 that measures the current flowing through the electric line 1007 is input to the storage battery system 1005, and charging and discharging of the storage battery system 1005 is controlled based on the measured value of the current transformer CT1. Furthermore, the output of the current transformer CT2 that measures the current flowing through the electric line 1007 is input to the fuel cell cogeneration system 1006, and the power generation of the fuel cell cogeneration system 1006 is controlled based on the measured value of the current transformer CT2. . Current transformer CT2 detects current supplied from commercial power system 1001 and solar power generation system 1004. During normal times (when power can be supplied from the commercial power grid), the power supplied from the commercial power grid 1001 and the solar power generation system 1004 is discharged from the storage battery system 1005 out of the power consumed by the domestic load 1003. This corresponds to the shortfall between the electric power and the electric power generated by the fuel cell cogeneration system 1006. When the measured value of the current transformer CT2 is not 0, the fuel cell cogeneration system 1006 generates power so that the measured value of the current transformer CT2 decreases or becomes 0, and supplies power to the domestic load 1003. (However, the amount of power generated by the fuel cell cogeneration system 1006 is limited to within the maximum rated supply amount.) At this time, the discharge from the storage battery system 1005 is faster than the reaction of the fuel cell cogeneration system 1006 to generate electricity. When the insufficient power consumption of the internal load 1003 is covered, the measured value of the current transformer CT2 becomes 0, and there is a possibility that the fuel cell cogeneration system 1006 determines that power generation is not necessary and stops generating power. There is.

Furthermore, during a power outage, at night, or in the rain, no power is supplied to the domestic load 1003 from either the commercial power grid 1001 or the solar power generation system 1004, so the measured value of the current transformer CT2 is 0. Therefore, the fuel cell cogeneration system 1006 will not generate electricity.

FIG. 9 shows the configuration of a power supply system 2000 including a fuel cell cogeneration system 1006, a storage battery system 1005, and a solar power generation system 1004. In the power supply system 2000 shown in FIG. 9, the storage battery system 1005 is connected together with the solar power generation system 1004 to the electric line 1007 where the commercial power system 1001 is connected to the distribution board 1002. The configuration is different from the supply system 1000. In the power supply system 2000 shown in FIG. 9, the current transformer CT1 is connected to the electric line 1007, and the current transformer CT2 is connected to the downstream part 1007a of the electric line 1007 from the solar power generation system 1004 and the storage battery system 1005.

At this time, the current transformer CT2 detects the current supplied from the commercial power system 1001, the solar power generation system 1004, and the storage battery system 1005. Therefore, depending on the current transformer CT2, it is not possible to directly detect the shortfall in the power consumption of the domestic load 1003 relative to the power supplied from the solar power generation system 1004 and the storage battery system 1005. When current is detected by the device CT2, the fuel cell cogeneration system 1006 attempts to generate electricity from the detected amount and supply it to the domestic load 1003, so the maximum supply of the fuel cell cogeneration system 1006 is prioritized and It will be consumed by the load 1003. At this time, the storage battery system 1005 supplies power to the domestic load 1003 so as to reduce the measured value of the current transformer CT1, and the solar power generation system 1004 sells the surplus power to the commercial power system 1001.

On the other hand, during a power outage, the fuel cell cogeneration system 1006 detects the power outage and switches to self-sustaining operation. Figure 10 shows the power supply system during a power outage. During self-sustaining operation, the fuel cell cogeneration system 1006 switches its operating mode, for example, by stopping power supply to the household load 1003 and supplying power to a specific load outlet. In the power supply system shown in FIG. 10, when a power outage occurs, the self-sustaining output of the storage battery system 1005 is outputted through the power line 1013 immediately after the power outage. Power line 1013 is connected to electric line 1007 on the upstream side of electric line 1007a. At this time, the fuel cell cogeneration system 1006 receives the output from the storage battery system 1005 or the solar power generation system 1004, determines that it is normal (power is being supplied from the commercial power 1001), and generates electricity to reduce the domestic load 1003. attempts to continue supplying power to the On the other hand, the fuel cell cogeneration system 1006 has a function of detecting whether the commercial power system 1001 is normal, and there is a possibility that it may be determined that the commercial power system 1001 is not normal. There are various ways to detect this, but one example is when an islanding detection function is installed that detects abnormalities such as power outages by step-injecting reactive power into the commercial power grid 1001 and detecting frequency fluctuations. Although power is being supplied to the system through the electric line 1007a, power is not being supplied from the commercial power system 1001, so the fuel cell cogeneration system 1006 detects an abnormality using the islanding detection function and stops operation. There is a possibility that it will happen. In this case, the independent operation of the fuel cell cogeneration system 1006 may also be stopped. In this way, if the operation of the fuel cell cogeneration system 1006 cools down due to an abnormal stop or the like, it may take a long time to start operating again.

JP 2019-198203 Publication

The present invention has been made in view of the above-mentioned problems, and enables distributed power sources and power supply devices that are interconnected with a commercial power grid and supply power to loads to appropriately operate independently during a power outage. The purpose is to provide technology.

The present invention for solving the above problems is as follows:
A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
a power supply device having a standalone operation output during a power outage of the commercial power system and a normal operation output during normal operation;
a full-load distribution board that supplies power supplied from the commercial power system, the distributed power source, and the power supply device to loads;
An electric power supply system comprising:
The full load distribution board is
a first input terminal into which the power supplied from the commercial power system is input; a second input terminal into which the self-sustaining output from the distributed power source is input; and an output from which the power supplied to the load is output. a terminal, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
a second connection part provided between the first connection part and the switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied to the first electric line from the commercial power system and controlling the distributed power source based on the detection result;
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. 2 current detectors;
It is characterized by having the following.

According to this, the first current detector detects the current supplied from the commercial power system to the first electric circuit, and the distributed power source is controlled based on the detection result of the first current detector. If the first current detector detects the current supplied from the commercial power grid, it is determined that the current is in a normal state where power is supplied from the commercial power grid, and the distributed power source is connected to the first A normal operation output is input to the electric circuit, and power is supplied to the load via a switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In addition, in the case of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source are stopped, so the first electric line connecting the first connection part and the second connection part has no current. is not detected, the power supply device can accurately detect the power outage state by the second current detector, and can appropriately perform self-sustaining operation.
Here, as the distributed power source, various power sources such as solar power generation, storage batteries, fuel cells, gas engines, wind power generation, tidal power generation, hydroelectric power generation, geothermal power generation, etc., or a combination of these can be used. Further, as the power supply device, various power sources such as solar power generation, storage batteries, fuel cells, gas engines, wind power generation, tidal power generation, hydroelectric power generation, geothermal power generation, etc., or a combination of these can be used. Furthermore, the distributed power source and the power supply device are not limited to stationary types, and may be portable types such as on-vehicle types, and the form thereof is not limited. The storage battery may be a battery for an electric vehicle or a hybrid vehicle. Moreover, the "switcher" includes automatic and manual switchers, and the mode of switching is not limited. The same applies to the following inventions.

Moreover, the present invention
A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection part and the switching device on the first electric power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied from the commercial power system to the first electric line and controlling the distributed power source based on the detection result; 1 current detector installation area,
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
This is a full-load distribution board characterized by being equipped with.

According to this, the first current detector installed in the first current detector installation area detects the current supplied from the commercial power system to the first electric circuit, and based on the detection result of the first current detector. distributed power sources are controlled. When the first current detector detects the current supplied from the commercial power grid, it is determined that the current is in a normal state where power is supplied from the commercial power grid, and the distributed power source is connected to the first A normal operation output is input to the electric circuit, and power is supplied to the load via a switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In addition, in the case of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source stop, so the first electric line connecting the first connection part and the second connection part has no current. is not detected, the second current detector installed in the second current detector installation area allows the power supply device to accurately detect the power outage state and appropriately perform self-sustaining operation.

Moreover, the present invention
A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection part and the switching device on the first electric power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
This is a full-load distribution board characterized by being equipped with.

According to this, when a current supplied from the commercial power system to the first electrical circuit is detected, it is determined that the power is being supplied from the commercial power system in a normal state, and the distributed power source is connected to the first connection line. A normal operation output is inputted to the first electric line from the input terminal, and power is supplied to the load via a switching device to which the first input terminal and the output terminal are connected. If the current supplied from the commercial power grid is not detected, it is determined that there is a power outage in which the power supply from the commercial power grid has stopped, and the distributed power source connects the first electrical line through the first connection. Stop inputting the normal operation output, input the standalone operation output to the second input terminal of the switching device, switch from the first input terminal to the second input terminal, and apply power to the load via the switching device connected to the output terminal. supply In addition, in the event of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source will stop, so the power supply equipment must accurately detect the power outage state and perform autonomous operation appropriately. I can do it.

Moreover, the present invention
A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection part and the switching device on the first electric power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
This is a full-load distribution board characterized by being equipped with.

According to this, when a current supplied from the commercial power system to the first electrical circuit is detected, it is determined that the power is being supplied from the commercial power system in a normal state, and the distributed power source is connected to the first connection line. A normal operation output is inputted to the first electric line from the input terminal, and power is supplied to the load via a switching device to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In addition, in the case of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source are stopped, so the first electric line connecting the first connection part and the second connection part has no current. is not detected, the second current detector installed in the second current detector installation area allows the power supply device to accurately detect the power outage state and appropriately perform self-sustaining operation.

Moreover, the present invention
A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
It has a first input terminal into which power supplied from the commercial power system is input, a second input terminal into which the self-sustaining output is input from the distributed power source, and an output terminal from which the power supplied to the load is output, A switching device that switches the first input terminal and the second input terminal and connects them to the output terminal, a system connection part to which the commercial power system is connected, the system connection part, and the first input terminal. a first electrical circuit to be connected; a first connection section provided on the first electrical circuit, to which the distributed power source is connected and to which a normal operation output is input from the distributed power source; a first current detector connected to the distributed power source for detecting the current supplied to the electrical circuit and controlling the distributed power source based on the detection result;
A power supply device used in a power supply system including:
It has an independent operation output during a power outage in the commercial power system and a normal operation output during normal operation,
a normal output section connected to a second connection section provided between the first connection section and the switching device on the first electrical circuit, and outputting the normal operation output;
a power outage output unit that outputs the self-sustaining output during a power outage;
Based on the detection result input from the second current detector that detects the current flowing through the first electric path connecting the first connection part and the second connection part, the normal output part and the power outage output part a control section that controls the section;
It is characterized by having the following.

According to this, in the power supply system, the first current detector detects the current supplied from the commercial power system to the first electric circuit, and the distributed power source is activated based on the detection result of the first current detector. controlled. If the first current detector detects the current supplied from the commercial power grid, it is determined that the current is in a normal state where power is supplied from the commercial power grid, and the distributed power source is connected to the first A normal operation output is input to the electric circuit, and power is supplied to the load via a switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In the power supply device used in such a power supply system, when there is a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source stop, so the first connection and the second Since no current is detected in the first electric path connecting the connecting portion, the second current detector can accurately detect a power outage state and perform self-sustaining operation appropriately.

Moreover, the present invention
A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
It has a first input terminal into which power supplied from the commercial power system is input, a second input terminal into which the self-sustaining output is input from the distributed power source, and an output terminal from which the power supplied to the load is output, A switching device that switches the first input terminal and the second input terminal and connects them to the output terminal, a system connection part to which the commercial power system is connected, the system connection part, and the first input terminal. a first electrical circuit to be connected, a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which a normal operation output is input from the distributed power source; a first current detector connected to the distributed power source for detecting a first current that is a current supplied to an electric circuit and controlling the distributed power source based on the detection result; Electric board and
A power supply control method for a power supply device used in a power supply system including:
The power supply device has an independent operation output during a power outage of the commercial power system and a normal operation output during normal times,
Flows through the first electrical path connecting the first connecting portion and a second connecting portion provided on the first electrical circuit, to which the power supply device is connected and to which normal operation output is input from the power supply device. detecting a second current that is an electric current;
supplying alternating current power to the load via a second connection provided between the first connection and the switch on the first electric current when the second current is detected; and,
a step of performing islanding detection;
a step of determining that the vehicle is not operating alone;
If the second current is not detected, supplying the self-sustaining output to a specific load connected to a specific load outlet connected to the power supply device;
It is characterized by including.

According to this, in the power supply system, the first current detector detects the current supplied from the commercial power system to the first electric circuit, and the distributed power source is activated based on the detection result of the first current detector. controlled. If the first current detector detects the current supplied from the commercial power grid, it is determined that the current is in a normal state where power is supplied from the commercial power grid, and the distributed power source is connected to the first A normal operation output is input to the electric circuit, and power is supplied to the load via a switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In the power supply device used in such a power supply system, when there is a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source stop, so the first connection and the second Since no current is detected in the first electrical path that connects the connection part, the second current detector can accurately detect the power outage state and perform autonomous operation appropriately, even if isolated operation detection is performed. The power supply device will not stop abnormally.

Moreover, the present invention
A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
a power supply device having a self-sustaining output during a power outage in a commercial power system and a normal operating output during normal times;
a power supply path that supplies power supplied from the commercial power system, the distributed power source, and the power supply device to a load;
An electric power supply system comprising:
The power supply path is
a first input terminal into which the power supplied from the commercial power system is input; a second input terminal into which the self-sustaining output from the distributed power source is input; and an output from which the power supplied to the load is output. a terminal, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
a second connection part provided between the first connection part and the switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied from the commercial power system to the first electric line and controlling the distributed power source based on the detection result;
A first electrical circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. 2 current detectors;
It is characterized by having the following.

According to this, the first current detector detects the current supplied from the commercial power system to the first electric circuit, and the distributed power source is controlled based on the detection result of the first current detector. If the first current detector detects the current supplied from the commercial power grid, it is determined that the current is in a normal state where power is supplied from the commercial power grid, and the distributed power source is connected to the first A normal operation output is input to the electric circuit, and power is supplied to the load via a switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In addition, in the case of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source are stopped, so the first electric line connecting the first connection part and the second connection part has no current. is not detected, the power supply device can accurately detect the power outage state by the second current detector, and can appropriately perform self-sustaining operation.

Moreover, the present invention
A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which a normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided on the first electric power line between the first connection portion and the switching device, and has an independent operation output during a power outage of a commercial power system and a normal operation output during normal times. a second connection portion into which the normal operation output is input from the power supply device;
This is a power supply path characterized by comprising:

According to this, when a current supplied from the commercial power system to the first electrical circuit is detected, it is determined that the power is being supplied from the commercial power system in a normal state, and the distributed power source is connected to the first connection line. A normal operation output is inputted to the first electric line from the input terminal, and power is supplied to the load via a switching device to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power system, it is determined that there is a power outage in which the power supply from the commercial power system has stopped, and the distributed power source is connected through the first connection part. The input of the normal operation output to the first electric circuit is stopped, the self-sustaining operation output is input to the second input terminal of the switching device, and the switching device is switched from the first input terminal to the second input terminal and connected to the output terminal. supplies power to the load through the In addition, in the event of a power outage, the power supplied from the commercial power system and the normal operation output of the distributed power source will stop, so the power supply equipment must accurately detect the power outage state and perform autonomous operation appropriately. I can do it.

Moreover, the present invention
A commercial power system, a distributed power source having a self-sustaining output during a power outage in the commercial power system and a normal operating output during normal times, and a power supply having a self-sustaining output during a power outage and a normal operating output during normal times in the commercial power system. a power supply path that supplies power supplied from the device to a load;
a power conversion unit that converts DC power output from the distributed power source into AC power;
A power conversion device comprising:
The power conversion section includes:
an output unit that outputs the AC power;
A first terminal connected to the output section, a second terminal connected to the first terminal during normal times, and a third terminal connected to the first terminal during a power outage, the second terminal a first switch that switches between and the third terminal and connects the first terminal to the first terminal;
a control unit that controls the power conversion unit based on a detection result of a first current detector that detects a current supplied from the commercial power system to the power supply path;
Equipped with
The power supply path is
a first input terminal to which electric power supplied from the commercial power system is input; and a second input terminal connected to the third terminal of the first switching device and to which the self-sustaining output is input from the output section. , an output terminal from which the power supplied to the load is output, and a second switch that switches the first input terminal and the second input terminal to connect to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection part provided on the first electric circuit and connected to the second terminal of the first switch;
A second connection part provided between the first connection part and the second switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device. and,
A first electrical circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
It is characterized by having the following.

According to this, the first current detector detects the current supplied from the commercial power system to the first electric circuit, and the control unit of the power conversion unit is controlled based on the detection result of the first current detector. Ru. When the first current detector detects the current supplied from the commercial power system, it is determined that the current is in a normal state where power is supplied from the commercial power system, and the power converter unit connects the first A normal operation output is input to the electric circuit, and power is supplied to the load via the second switch to which the first input terminal and the output terminal are connected. If the first current detector does not detect the current supplied from the commercial power grid, it is determined that there is a power outage in which power supply from the commercial power grid has stopped, and the control unit switches the switching unit to By connecting the first terminal and the third terminal, the input of the normal operation output to the first electrical circuit through the first connection part is stopped, and the input of the normal operation output to the first electrical circuit through the third terminal of the first switching device is stopped, and the second input of the second switching device is connected through the third terminal of the first switching device. A self-sustaining output is input to the terminal, and power is supplied to the load via a second switch that switches from the first input terminal to the second input terminal and connects to the output terminal. In addition, in the case of a power outage, the power supplied from the commercial power system and the normal operation output from the power converter stop, so the first electric line connecting the first connection part and the second connection part is Since no current is detected, the second current detector installed in the second current detector installation area allows the power supply device to accurately detect a power outage state and perform self-sustaining operation appropriately.

Moreover, the present invention
A power conversion device having a power supply path,
The power supply path includes a grid connection section that connects the commercial power system, a distributed power supply normal line that supplies power from the distributed power source during normal times of the commercial power system, and a distributed power supply line that supplies power from the distributed power source during a power outage of the commercial power system. A distributed power supply power outage circuit that supplies power from a type power supply, a load connection part that outputs power to a load, and a switch that switches to one of two contacts and connects it to the output side,
The switching device connects a first electrical line connected to the system connection part and the distributed power supply normal circuit to one of the contacts, and connects the distributed power supply power outage circuit to the other contact. , connects the load connection part to the output side,
The power supply path connects a first connection part that connects the distributed power supply normal power line to the first power line, and a normal output line of the power supply device between the first connection part and the switch. It is characterized by having a second connection part.

According to this, during normal times when power is supplied from the commercial power system via the grid connection, the distributed power source inputs the normal operation output from the distributed power supply normal line to the first line via the first connection. However, the power supply device usually always inputs the normal operation output from the output line to the first electrical circuit via the second connection part, and the switching device connects one contact connected to the first electrical circuit and the output side. This supplies power to the load via the load connection connected to the output side. Then, in the event of a power outage when the power supply from the commercial power system is stopped, the distributed power source stops inputting the normal operation output to the first electric line through the first connection part, and transfers the autonomous operation output to the distributed power supply line during the power outage. The switch is switched to connect the other terminal and the output side, thereby supplying power to the load via the load connection connected to the output side. Thereby, the distributed power source can appropriately perform self-sustaining operation.

Moreover, the present invention
A connection method in a power conversion device having a power supply path, the method comprising:
The power supply line includes a first line connected to the commercial power system, a distributed power supply normal line that supplies power from the distributed power source during normal times of the commercial power system, and a first line connected to the commercial power system during a power outage. A distributed power outage circuit that supplies power from the distributed power source, a load output line that outputs the power supplied to the load, and a switch that switches to one of the two contacts and connects it to the output side. connect and
The first electrical circuit and the distributed power supply normal circuit are connected to one of the two contacts of the switch, the distributed power supply power failure circuit is connected to the other contact, and the distributed power supply circuit is connected to the output side. Connect the load output line,
Connecting the distributed power source normal power line to a first connection part in the middle of the first power line, and supplying power to a second connection part of the first power line between the first connection part and the switching device. It is characterized in that a normal output line through which power supplied from the device is output is connected.

According to this, during normal times when power is supplied from the commercial power system via the first electrical line, the distributed power source inputs the normal operation output from the distributed power supply normal electrical line to the first electrical line via the first connection part. However, the power supply device usually always inputs the normal operation output from the output line to the first electrical circuit via the second connection part, and the switching device connects one contact connected to the first electrical circuit and the output side. By doing so, power is supplied to the load through the load output line connected to the output side. Then, in the event of a power outage when the power supply from the commercial power system is stopped, the distributed power source stops inputting the normal operation output to the first electric line through the first connection part, and transfers the autonomous operation output to the distributed power supply line during the power outage. The switch is switched to connect the other terminal and the output side, thereby supplying power to the load through the load output line connected to the output side. Thereby, the distributed power source can appropriately perform self-sustaining operation.

Moreover, the present invention
A first electrical line that inputs power from the commercial power system, an input power line that inputs power from the distributed power source during normal times of the commercial power system, and an input power line that inputs power from the distributed power source during a power outage of the commercial power system. A power line during a power outage, an output power line that outputs power to the load, a specified power line that inputs power from the power supply device, and a switch that switches to one of the two input sides and connects it to the output side. A method of connecting,
Connecting the first electrical path and the input power line to one of the input sides of the switch, connecting a power outage line to the other input side, and connecting an output power line to the output side of the switch,
The input power line is connected to the first electric path at a first connection part on the way to the switch, and the specific power line is connected to the second connection part on the way from the first connection part to the switch. It is characterized by connecting.

According to this, during normal times when power is supplied from the commercial power system via the first electrical path, the distributed power source inputs the normal operation output from the input power line to the first electrical path via the first connection, and supplies power. The device inputs the normal operation output from the specific power line to the first electrical circuit through the second connection part, and the switching device connects one input side connected to the first electrical circuit and the output side, so that the output side power to the load through an output power line connected to the Then, in the event of a power outage when the power supply from the commercial power system is stopped, the distributed power source stops inputting the normal operation output to the first power line through the first connection, and outputs the standalone operation output to the power line during the power outage. , the switch is switched to connect the other input side and the output side, thereby supplying power to the load through the output power line connected to the output side. Thereby, the distributed power source can appropriately perform self-sustaining operation.

Furthermore, in the present invention,
By connecting the switching device to one of the input sides during the normal time, the power supplied to the load is supplied as combined power via the first electric path, the input power line, and the specific power line. is,
At the time of a power outage, the switching device is connected to the other input side, so that the power supplied to the load is supplied as power via the power line at the time of a power outage.

In this way, in normal times, one input side of the switching device is connected to the output side, so the power supplied from the commercial power system through the first electrical path and the normal operation output supplied from the distributed power source through the input power. , and the normal operation output supplied from the power supply device through the specific power line are combined and supplied to the load. Furthermore, in the event of a power outage, the other input side of the switch is connected to the output side, so that the self-sustaining output supplied from the distributed power supply is supplied to the load.

Furthermore, in the present invention,
At the time of the power outage, the power supply device may supply the self-sustaining output through a specific load outlet.

In this way, the distributed power source and the power supply device can each supply independent operation outputs.

Furthermore, in the present invention,
A specific current detector installation area for installing a specific current detector for the power supply device to detect current may be provided between the first connection part and the second connection part.

In this way, by installing a specific current detector that detects the current supplied from the commercial power system and the current supplied from the distributed power supply in the specific current detector installation area, the power supply device can It is possible to accurately control power based on the power supplied from the grid and the power supplied from the distributed power sources.

According to the present invention, it is possible to provide a technology in which a distributed power source and a power supply device that are interconnected with a commercial power system and supply power to a load can appropriately perform self-sustaining operation at the time of a power outage.

1 is a schematic configuration diagram of a power supply system during normal operation according to a first embodiment of the present invention. 1 is a schematic configuration diagram of a power supply system during a power outage according to a first embodiment of the present invention. 1 is a flowchart illustrating a power supply control method for a fuel cell cogeneration system according to Example 1 of the present invention. It is a schematic block diagram of the electric power supply system based on Example 2 of this invention. It is a schematic block diagram of the full load distribution board based on Example 3 of this invention. It is a schematic block diagram of the electric power supply system based on Example 4 of this invention. It is a schematic block diagram of the hybrid power conditioner based on Example 5 of this invention. It is a figure explaining a conventional example. It is a figure explaining another conventional example in normal times. It is a figure explaining another conventional example at the time of a power outage.

[Application example]
Hereinafter, a power supply system according to an application example of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a power supply system 1 according to a first embodiment of the present invention. FIG. 1 shows a power supply system 1 during a normal time when power supply from a commercial power system 10 is not stopped, and FIG. 2 shows a power supply system 1 during a power outage when power supply from a commercial power system has stopped.
In the power supply system, power supplied from a commercial power system 10 is supplied to domestic loads 11 via a full load distribution board 100 and a main distribution board 400. The household load 11 is also supplied with power output from the solar power generation system 200, the storage battery system 300, and the fuel cell cogeneration system 500. In the following description, unless otherwise specified, the commercial power system 10 side will be referred to as "upstream" and the domestic load 11 side will be referred to as "downstream".

Solar power generation system 200 includes a PV panel 210 and a PV power conditioner 220. If the power generated by the solar power generation system 200 exceeds the power consumption by the domestic load 11, the surplus power is sold to the commercial power system 10 or used to charge the storage battery unit 310. Ru.

Storage battery system 300 includes a storage battery unit 310 and a power conditioner 320. DC power discharged from the storage battery unit 310 is input to the power conditioner 320 via the power line 311. The DC power input to the power conditioner 320 is converted to AC power and output through the power line 103. Further, AC power input to the power conditioner 320 through the power line 103 is converted to DC power and charges the storage battery unit 310.
During a power outage, the power conditioner 320 of the storage battery unit 310 stops outputting AC power to the power line 103 and outputs AC power as a self-sustaining output through the power line 120.

The DC power generated within the fuel cell cogeneration system 500 is converted to AC power and output through the power line 105. During a power outage, the fuel cell cogeneration system 500 stops outputting AC power to the power line 105 and outputs AC power to the load connected to the specific load outlet 13 as a self-sustaining output through the power line 14.

The commercial power system 10 is connected to an automatic switch 110 through an electric line 101 within a full-load distribution board 100 . A power line 102 through which AC power is output from the solar power generation system 200 is connected to the electric line 101 at a connection part CP1. Further, a power line 103 to which AC power is output from the storage battery system 300 is connected to the electric line 101 at a connection part CP2 on the downstream side of the connection part CP1. Through the power line 103, AC power supplied from the commercial power system 10 or the solar power generation system 200 is supplied to charge the storage battery unit 310. Further, on the downstream side of the connection portion CP2 of the electric line 101, a power line 105 through which AC power is output from the fuel cell cogeneration system 500 is connected between the connection portion CP2 and the automatic switching device 110.

A current transformer CT1 that detects the current flowing through the electric line 101 is provided on the upstream side of the connection part CP1 and the connection part CP2 of the electric line 101. The detection output of current transformer CT1 is input to power conditioner 320 of storage battery system 300 via signal line DL1.

A current transformer CT2 is provided between the connection portion CP2 and the connection portion CP3 of the electric line 101 to detect the current flowing through the electric line 101. The detection output of current transformer CT2 is input to fuel cell cogeneration system 500 via signal line DL2.

When a voltage is detected at the power conditioner connection portion of the power line 103, the power conditioner 320 determines that it is normal, that is, the power supply from the commercial power system 10 continues normally without stopping. When it is determined that the time is normal, the storage battery system 300 outputs AC power through the power line 103 and supplies the AC power to the domestic load 11, as described above. As an example of a method for detecting whether the commercial power grid 10 is normal, reactive power is injected into the commercial power grid 10 in steps and frequency fluctuations are detected to detect whether it is normal or abnormal such as a power outage. There is.

If no voltage is detected at the power conditioner connection part of the power line 103, the power conditioner 320 determines that the power supply from the commercial power system 10 has stopped, that is, there is a power outage, and the AC power is transmitted through the power line 103. The output of electric power is stopped, and AC power is output as a self-sustaining output through the power line 120.
In addition, when a power outage is determined, the solar power generation system 200 stops outputting AC power through the power line 102 and connects the PV power conditioner 220 to the power conditioner 320 of the storage battery system 300 through the power line 212. In contrast, AC power is output.

In the fuel cell cogeneration system 500, the current flowing through the electric line 101 is detected by the current transformer CT2. When the fuel cell cogeneration system 500 detects that the voltage at the connection point of the power line 105 connected to the commercial power system 10 is normal, the fuel cell cogeneration system 500 operates normally, that is, the power supply from the commercial power system 10 does not stop and is normally performed. judged to be continuing. At this time, the fuel cell cogeneration system 500 outputs AC power through the power line 105 and supplies the AC power to the household load 11 (normal operation mode). As an example of a method for detecting whether the commercial power grid 10 is normal, reactive power is injected into the commercial power grid 10 in steps and frequency fluctuations are detected to detect whether it is normal or abnormal such as a power outage. There is. The method of step injection of reactive power can also be used for detection during standalone operation.

Furthermore, when the fuel cell cogeneration system 500 executes the islanding detection function, it is determined that there is "no abnormality", that is, there is no islanding state, since the power supply from the commercial power grid 10 is not stopped during normal times. .

When the fuel cell cogeneration system 500 detects that the voltage at the connection point of the power line 105 connected to the commercial power system 10 has decreased or is not present, it determines that a power outage has occurred, switches to the self-sustaining mode, and connects the power line 105 to the commercial power system 10. output of AC power is stopped, and AC power is output as an independent operation output through the power line 14 connected to the specific load outlet 13, and AC power is supplied to the load connected to the specific load outlet 13. . Note that during independent operation, independent operation detection is not performed. In other words, the fuel cell cogeneration system 500 does not perform a method of detecting whether the commercial power system 10 is normal during a power outage.

As described above, when the power supply from the commercial power system 10 is stopped, no voltage is generated at the contact 110a of the automatic switch 110. On the other hand, since voltage appears at the contact 110b due to the power line 120 connected to the power conditioner 320 of the storage battery system 300, as shown in FIG. 2, the automatic switch 110 connects the contact 110c and the contact 110b. It can be switched as follows.

In this way, according to the power supply system 1, even during a power outage, the fuel cell cogeneration system 500, the storage battery system 300, and the solar power generation system 200 can each appropriately perform self-sustaining operation.

[Example 1]
EMBODIMENT OF THE INVENTION Hereinafter, the structure of the electric power supply system 1 based on Example 1 of this invention is demonstrated with reference to drawings. However, the configuration of the apparatus described in this example should be modified as appropriate depending on various conditions. That is, the scope of the present invention is not intended to be limited to the following examples.

FIG. 1 is a schematic configuration diagram of a power supply system 1 according to a first embodiment of the present invention. In FIG. 1, the electric circuit and the power line are shown as one line, but in reality, it is composed of three electric circuits and power lines for each phase: U phase, O phase, and W phase. In addition, in FIG. 1 , the main contract breaker, the solar power generation system 200 , the storage battery system 300 , the fuel cell cogeneration system 500 , each system, and the main distribution board 400 are shown with breakers for preventing excessive current from flowing. Although omitted, these devices are actually connected. FIG. 1 shows a power supply system 1 during normal times when power supply from a commercial power grid 10 is not stopped, and FIG. 2 shows a power supply system during a power outage when power supply from a commercial power grid has stopped. .
In the power supply system 1 , power supplied from a commercial power system 10 is supplied to a domestic load 11 via a full-load distribution board 100 , a main distribution board 400 , and a power line 12 . The household load 11 is also supplied with power output from the solar power generation system 200, the storage battery system 300, and the fuel cell cogeneration system 500. In the following description, unless otherwise specified, the commercial power system 10 side will be referred to as upstream, and the domestic load 11 side will be referred to as downstream.
Here, the power supply system 1 corresponds to the power supply system of the present invention. Further, the power supply system 1 according to the first embodiment is configured by specifically applying the connection method of the present invention.

The solar power generation system 200 includes a PV panel 210 that generates DC power by irradiation with sunlight, and a PV power generator that transforms the voltage of the DC power output from the PV panel 210, converts the DC power into AC power, and outputs the converted DC power. Includes conditioner 220. If the power generated by the solar power generation system 200 exceeds the power consumption by the domestic load 11, the surplus power is sold to the commercial power system 10 or used to charge the storage battery unit 310. Ru.
Here, the solar power generation system 200 corresponds to the distributed power source of the present invention.

The storage battery system 300 includes a storage battery unit 310 including a secondary battery capable of storing DC power, and a power conditioner 320. DC power discharged from the storage battery unit 310 is input to the power conditioner 320 via the power line 311. The voltage of the DC power input to the power conditioner 320 is transformed, and the AC power is output through the power line 103. In addition, AC power input to the power conditioner 320 through the power line 103 is converted to DC power and transformed to a voltage suitable for charging. is charged.
During a power outage, the power conditioner 320 of the storage battery unit 310 stops outputting AC power to the power line 103 and outputs AC power as a self-sustaining output through the power line 120. The power conditioner 320 outputs a self-sustaining output to the power line 120 via a transformer unit (not shown). The transformer unit may be built into the power conditioner 320, or may be provided separately from the power conditioner as shown in FIG.
Here, the storage battery system 300 corresponds to the distributed power source of the present invention. Further, the power line 120 corresponds to a power line during a power outage according to the present invention.

The fuel cell cogeneration system 500 produces hydrogen by reforming city gas, reacts oxygen in the air to generate electricity, and uses the heat generated by the electricity generation to heat and store water. The DC power generated within the fuel cell cogeneration system 500 is converted to AC power and output through the power line 105.
During a power outage, the fuel cell cogeneration system 500 stops outputting AC power to the power line 105 and outputs AC power to the load connected to the specific load outlet 13 as a self-sustaining output through the power line 14.
Here, the fuel cell cogeneration system 500 corresponds to the power supply device of the present invention.

The commercial power system 10 is connected within the full load distribution board 100 to an electric line 101 via a connection part CP, and further connected to an automatic switching device 110 via the electric line 101. A power line 102 through which AC power is output from the solar power generation system 200 is connected to the electric line 101 at a connection portion CP1. Further, a power line 103 to which AC power is output from the storage battery system 300 is connected to the electric line 101 at a connection part CP2 on the downstream side of the connection part CP1. Through the power line 103, AC power supplied from the commercial power system 10 or the solar power generation system 200 is supplied to charge the storage battery unit 310. Furthermore, a power line 105 through which AC power is output from the fuel cell cogeneration system 500 is connected to a connection part CP3 located between the connection part CP2 and the automatic switching device 110 on the downstream side of the connection part CP2 of the electric line 101. .
Here, the connection part CP corresponds to the system connection part of the present invention. The electric path 101 corresponds to the first electric path of the present invention. Further, the connecting portion CP1 and the connecting portion CP2 correspond to the first connecting portion of the present invention. The AC power input from the solar power generation system 200 to the electric line 101 through the connection part CP1 and the AC power input from the storage battery system 300 to the electric line 101 through the connection part CP2 correspond to the normal operation output of the present invention. Further, the connection portion CP3 corresponds to the second connection portion of the present invention, and the AC power input from the fuel cell cogeneration system 500 to the electric line 101 through the second connection portion corresponds to the normal operation output of the present invention. Moreover, the power line 102 and the power line 103 correspond to the input power line of the present invention.

The automatic switching device 110 has a contact 110c to which the power line 104 that supplies AC power to the main distribution board 400 is connected, a contact 110a to which the electric line 101 is connected, and AC power is output from the storage battery system 300 as a self-sustaining output. and a contact 110b to which the power line 120 is connected, and the contact 110c is switched to be connected to either the contact 110a or the contact 110b. The automatic switch 110 is basically switched to the contact 110a or the contact 110b which is generating voltage, and is connected to the contact 110c. In this embodiment, the switching of the automatic switching device 110 may be "automatic", "manual" by human operation, or controlled by a system. good. The automatic switch can also be replaced by a manual switch or a system-controlled switch. The same applies to the following examples.
Here, the automatic switching device 110 corresponds to the switching device of the present invention. Further, the contact 110a, the contact 110b, and the contact 110c correspond to a first input terminal, a second input terminal, and an output terminal of the present invention, respectively. Further, the contact 110a and the contact 110b correspond to two input sides of the present invention, and correspond to one input side and the other input side of the present invention, respectively. Further, the contact 110c corresponds to the output side of the present invention. Moreover, the power line 104 (and the power line 12) corresponds to the output power line of the present invention.

A current transformer CT1 that detects the current flowing through the electric path 101 is provided upstream of the connection portion CP1 and the connection portion CP2 of the electric path 101. The detection output of current transformer CT1 is input to power conditioner 320 of storage battery system 300 via signal line DL1.
Here, the current transformer CT1 corresponds to the first current detector of the present invention, and the detection output of the current transformer CT1 corresponds to the detection result of the first current detector of the present invention. Further, the current flowing through the electric line 101 on the upstream side of the connection part CP1 and the connection part CP2 of the electric line 101 corresponds to the first current of the present invention.

A current transformer CT2 that detects the current flowing through the electric path 101 is provided between the connection portion CP2 and the connection portion CP3 of the electric path 101, that is, on the downstream side of the connection portion CP2 and the upstream side of the connection portion CP3. The detection output of current transformer CT2 is input to fuel cell cogeneration system 500 via signal line DL2.
Here, the current transformer CT2 corresponds to the second current detector and the specific current detector of the present invention, and the detection output of the current transformer CT2 corresponds to the detection result of the second current detector of the present invention. Further, the current flowing through the electrical path 101 between the connecting portion CP2 and the connecting portion CP3 of the electrical path 101, that is, on the downstream side of the connecting portion CP2 and the upstream side of the connecting portion CP3, corresponds to the second current of the present invention.

In the storage battery system 300, when voltage is detected at the power conditioner connection part of the power line 103, it is determined that it is normal, that is, the power supply from the commercial power system 10 continues normally without stopping. . When it is determined that the time is normal, the storage battery system 300 outputs AC power through the power line 103 as described above, and connects it to the home via the connection part CP2, the automatic switch 110, and the main distribution board 400. AC power is supplied to the load 11 or AC power is input through the power line 103 to charge the storage battery unit 310.

If no voltage is detected at the power conditioner connection part of the power line 103, the power conditioner 320 of the storage battery system 300 determines that the power supply from the commercial power system 10 has stopped, that is, there is a power outage. , the output of AC power through the power line 103 is stopped. Therefore, the supply of AC power from the storage battery system 300 to the electric line 101 via the connection part CP2 is stopped. Furthermore, when the power conditioner 320 of the storage battery system 300 determines that there is a power outage, it outputs AC power as a self-sustaining output through the power line 120.
In addition, when a power outage is determined, the solar power generation system 200 stops outputting AC power through the power line 102 and connects the PV power conditioner 220 to the power conditioner 320 of the storage battery system 300 through the power line 212. On the other hand, it outputs DC or AC power.

In the fuel cell cogeneration system 500, the current flowing through the electric line 101 is detected by the current transformer CT2. A current supplied from the commercial power system 10, the storage battery system 300, and the solar power generation system 200 flows through the electric line 101 at a position between the connection portion CP2 and the connection portion CP3 where the current transformer CT1 is provided. That is, the amount of power consumed by the household load 11 excluding the amount supplied by the fuel cell cogeneration system 500 is detected by the current transformer CT2. A method for controlling power supply by the fuel cell cogeneration system 500 will be described below with reference to the flowchart in FIG. 3.
When the fuel cell cogeneration system 500 detects that the voltage at the connection part of the power line 105 connected to the commercial power system 10 is normal, that is, when the result in step S1 of FIG. It is determined that the power supply from the commercial power system 10 continues normally without being stopped. At this time, the fuel cell cogeneration system 500 outputs AC power through the power line 105, and supplies AC power to the domestic load 11 via the connection part CP3, the automatic switch 110, and the main distribution board 400 (usually operation mode) (step S2).

The fuel cell cogeneration system 500 also includes an islanding detection function. Island operation is a state in which the solar power generation system 200, the storage battery system 300, and the fuel cell cogeneration system 500 supply power to the domestic load 11 when an accident or the like occurs in the commercial power system 10 and the power supply is stopped. It is. There are various methods for islanding detection. For example, one method involves injecting reactive power to cause frequency fluctuations in the output voltage, and determining whether or not islanding is occurring based on the magnitude of the resulting frequency fluctuation. There is. At this time, the moving average value of the grid cycle is calculated and stored, the latest moving average value is compared with the past moving average value to calculate the deviation amount, and the grid cycle changes further based on the deviation amount. It is known that the islanding state can be determined quickly by injecting reactive power in the direction. Although the solar power generation system 200 and the storage battery system 300 can also be provided with such an islanding detection function, the description thereof will be omitted.
When the above-described islanding operation detection is performed (step S3), it is determined that there is "no abnormality", that is, there is no islanding state (step S4), since the power supply from the commercial power grid 10 is not stopped during normal times. ). The current detection by the current transformer CT2 is repeated at appropriate timing, and the process returns to step S1.

When the fuel cell cogeneration system 500 detects that the voltage at the connection part of the power line 105 connected to the commercial power system 10 has decreased or is not present, that is, when the answer is Yes in step S1 of FIG. , determines that there is a power outage, switches to the self-sustaining mode, stops the output of AC power through the power line 105, outputs AC power as the self-sustaining output through the power line 14 connected to the outlet 13 for the specific load, and switches to the self-sustaining mode. AC power is supplied to the load connected to the outlet 13 (step S5).

As described above, when the power supply from the commercial power system 10 is stopped, there is no power from any of the solar power generation system 200, the storage battery system 300, and the fuel cell cogeneration system 500 to the electric line 101 connected to the commercial power system 10. Since the power supply is also stopped, no voltage is generated at the contact 110a of the automatic switch 110. On the other hand, since voltage appears at the contact 110b due to the power line 120 connected to the power conditioner 320 of the storage battery system 300, as shown in FIG. 2, the automatic switch 110 connects the contact 110c and the contact 110b. It can be switched as follows.

When the power is restored from the power outage and power supply from the commercial power system 10 is started, the storage battery system 300 detects that voltage is present at the power conditioner connection part of the power line 103, determines that it is normal, and disconnects the power line from the power line 103. The self-sustaining output from 120 is stopped. In the automatic switch 110, since no voltage appears at the contact 110b and a voltage is generated at the contact 110a, the contact 110b is switched to the contact 110a, and the contact 110c and the contact 110a are connected. If it is detected that the voltage at the connection point of the power line 105 connected to the commercial power system 10 is normal, the fuel cell cogeneration system 500 determines that the normal state has returned, and generates the current detected by the current transformer CT2. , outputs AC power through the power line 105, and connects the connection part CP3 and the automatic switching device 1.
10. Power is supplied to the domestic load 11 via the main distribution board 400.
In this first embodiment, a configuration in which the current transformer CT1 is provided between the connection part CP in the full load distribution board 100 and the connection part CP1 of the electric line 101 is illustrated, but the position of the current transformer CT1 is It may be provided outside the full-load distribution board 100, for example, it may be provided at an upstream position immediately in front of the connection portion CP. This is because, as shown in the figure, the current value at the downstream position immediately after the connection part CP and the current value at the upstream position immediately before the connection part CP are substantially the same. This modification can be similarly applied to other embodiments described below.

In this way, according to the power supply system 1, even during a power outage, the fuel cell cogeneration system 500, the storage battery system 300, and the solar power generation system 200 can each appropriately perform self-sustaining operation.

[Example 2]
FIG. 4 shows a schematic configuration of a power supply system 1 according to a second embodiment of the present invention. For configurations common to those in the first embodiment, the same reference numerals are used and detailed explanations are omitted.

The power supply system 1 shown in FIG. 4 has the same overall configuration as the power supply system 1 shown in FIG. 1, except that the structure of the fuel cell cogeneration system 500 is clearly shown. In FIG. 4, the automatic switching device 110 is in a normal connected state. Although the operation of the power supply system 1 is the same as that described in the first embodiment, parts related to each configuration of the fuel cell cogeneration system 500 will be explained again. The power supply system 1 according to the second embodiment is configured by specifically applying the connection method of the present invention.

Fuel cell cogeneration system 500 mainly includes a control section 510, a fuel cell unit 520, and a hot water storage tank 540. The control unit 510 is a computer that controls the entire operation of the fuel cell cogeneration system 500, and includes a processor such as a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access).
Memory) etc. The fuel cell unit 520 is a hydrogen production device that produces water by reforming city gas, a power generation device that includes a fuel cell that reacts hydrogen and oxygen in the air to generate electricity and heat, and a power generation device that generates electricity. It includes an inverter that converts DC power into AC power, and a heat recovery device that recovers the heat generated by the power generator. The storage tank is a tank that stores hot water heated by the heat recovery device.

In the fuel cell cogeneration system 500, a signal line DL2 connected to the current transformer CT2 is input to the control unit 510. The fuel cell unit 520 also has a power output unit 521 that supplies alternating current power (normal operation output) to household loads through the power line 105 during normal times, and a power output unit 521 that supplies AC power (normal operation output) to a household load during a power outage through the power line 14 to a load connected to the specific load outlet 13 during a power outage. It also includes a power outage output unit 522 that supplies AC power (self-sustaining output). The power output unit 521 and the control unit 510 can also realize the islanding detection function described in the first embodiment.
Here, the control section 510, the power output section 521, and the power outage output section 522 correspond to the control section, the normal output section, and the power outage output section of the present invention, respectively.

As described in the first embodiment, the power line 105 is connected to the electrical circuit 101 at the connection part CP3 provided between the automatic switch 110 and the connection part CP2, and the current transformer CT2 is connected to the connection part CP2 and the connection part CP2. It is provided between the CP3 and the CP3.

In the fuel cell cogeneration system 500, when it is detected that the voltage at the connection point of the power line 105 connected to the commercial power system 10 is normal, the control unit 510 controls the power supply from the commercial power system 10 during normal times. is determined to be continuing without stopping, and the power output unit 5
21 outputs AC power through the power line 105, and supplies the AC power to the household load 11 via the connection part CP3, the automatic switch 110, and the main distribution board 400.

In the fuel cell cogeneration system 500, when the current detected by the current transformer CT2 is "no" (the detected value is 0), the voltage at the connection part of the power line 105 connected to the commercial power system 10 decreases. If it is detected that the voltage is not coming, the control unit 510 determines that there is a power outage, switches to the self-sustaining mode, stops the output of AC power from the power output section 521 via the power line 105, and outputs the self-sustaining operation. As a result, the power outage output unit 522 outputs AC power through the power line 14 connected to the specific load outlet 13, and supplies AC power to the load connected to the specific load outlet 13.

In this way, the fuel cell cogeneration system 500 in the power supply system 1 can appropriately perform self-sustaining operation even during a power outage.

[Example 3]
FIG. 5 shows the configuration of a distribution board 600 used as the full-load distribution board 100 of the power supply system 1 according to the first and second embodiments. A distribution board 600 according to the third embodiment is configured by specifically applying the connection method of the present invention.

The distribution board 600 includes a system connection part CP61 to which a commercial power system is connected, an automatic switch 610, and an electric line 601 that connects the system connection part CP61 and the automatic switch 610. On the electric line 601, there is normally a first power supply connection part CP62 to which a first power supply, which is a distributed power supply such as the storage battery system 300, is connected via the power line 102 and the power line 103 (or the power line 107); A second power supply connection part CP63 to which a second power supply such as the fuel cell cogeneration system 500 is connected via the power line 105, and a first current detector such as a current transformer CT1 to which a detection output is input to the first power supply. A first current detector installation area Ar1 where a current detector can be installed, and a second current detector installation area Ar2 where a second current detector such as a current transformer CT2 whose detection output is input to a second power source can be installed. It is provided.
Here, the system contact part CP61 corresponds to the system connection part of the present invention. Further, the electric path 601 corresponds to the first electric path of the present invention. The first power supply connection part CP62 corresponds to the first connection part of the present invention. The second power supply connection part CP63 corresponds to the second connection part of the present invention. The current transformer CT1 and the first current detector installation area Ar1 correspond to the first current detector and the first current detector installation area of the present invention, respectively. In addition, the current transformer CT2 and the second current detector installation area Ar2 are respectively the second current detector (or specific current detector) and the second current detector installation area (specific current detector installation area) of the present invention. Equivalent to. Moreover, the power line 102 and the power line 103 (or the power line 107) correspond to the input power line of the present invention. Further, the power line 120 corresponds to a power line during a power outage according to the present invention. Moreover, the power line 105 corresponds to the specific power line of the present invention.

The automatic switch 610 includes a contact 610a to which the electric line 601 is connected, a third power supply connection part 610b to which a third power source capable of supplying power is connected in the event of a power outage, and a contact 610c to which a load is connected. The automatic switch 610 has a function of automatically switching to connect the contact 610c, the contact 610a, and the third power supply connection part 610b to whichever voltage is being generated.
Here, the automatic switch 610 corresponds to the automatic switch of the present invention. Further, the contact 610a, the third power supply connection portion 610b, and the contact 610c correspond to a first input terminal, a second input terminal, and an output terminal of the present invention, respectively. Further, the contact 610a and the third power supply connection portion 610b correspond to two input sides of the present invention, and correspond to one input side and the other input side of the present invention, respectively. Further, the contact 610c corresponds to the output side of the present invention.

The commercial power system 10 is connected to the grid connection part CP61, the storage battery system 300 is connected to the first power supply connection part CP62 via the power line 103, and the storage battery system 300 is connected to the first current detector installation area Ar1 through the signal line DL1. A current transformer CT1 to which the detection output is input is installed, a storage battery system 300 is connected to the third power supply connection part 610b via the power line 120, and a fuel cell system is connected to the second power supply connection part CP63 via the power line 105. The cogeneration system 500 is connected, and a current transformer CT2 whose detection output is input to the fuel cell cogeneration system 500 through the signal line DL2 is installed in the second current detector installation area Ar2, and the current transformer CT2 is connected to the contact 610c through the power line 104. The operation of the power supply system configured by connecting the main distribution board 400 and the domestic load 11 is as described in the first and second embodiments.
Here, power line 104 corresponds to the output power line of the present invention.

The commercial power system 10 is connected to the grid connection part CP61, the storage battery/solar power generation hybrid system 301 (see FIG. 6), which will be described later, is connected to the first power supply connection part CP62 via the power line 107, and the first current detector A current transformer CT1 whose detection output is input to the storage battery/solar power generation hybrid system 301 through the signal line DL1 is installed in the installation area Ar1, and a current transformer CT1 whose detection output is input to the storage battery/solar power generation hybrid system 301 through the signal line DL1 is installed, and the storage battery/solar power generation is connected to the third power supply connection part 610b through the power line 108. The hybrid system 301 is connected, the fuel cell cogeneration system 500 is connected to the second power supply connection part CP63 via the power line 105, and the fuel cell cogeneration system 500 is connected to the second detection unit installation area Ar2 through the signal line DL2. The operation of the power supply system configured by installing the current transformer CT2 into which the detection output is input and connecting the domestic load 11 to the contact 610c via the power line 106 is as described in the third embodiment.

By using such a distribution board 600, the power supply system 1 can be created in which the fuel cell cogeneration system 500, the storage battery system 300, and the solar power generation system 200 can each perform independent operation appropriately even during a power outage. Can be built. Furthermore, by using such a distribution board 600, the power supply system 2 can be configured such that the fuel cell cogeneration system 500 and the storage battery/solar power generation hybrid system 301 can each appropriately operate independently even during a power outage. can be constructed.
In addition, the distribution board 600 includes a system connection part CP61, an electric line 601, a first current detector installation area Ar1, a first power supply connection part CP62, a second current detector installation area Ar2, a second connection part CP63, and an automatic The switch 610 is not limited to the distribution board 600, but has a configuration that can be applied to power supply systems in various forms, and corresponds to the power supply path of the present invention.
In this embodiment, the first current detector installation area Ar1 is provided at a position between the system connection part CP61 and the first power supply connection part CP62 in the distribution board 600, but it is not limited to this position. It may be provided at a position outside the panel 600 and at a position upstream immediately in front of the system connection part CP61.

[Example 4]
FIG. 6 shows a power supply system 2 according to the fourth embodiment. Components that are common to the first and second embodiments are given the same reference numerals and detailed explanations will be omitted. The power supply system 1 corresponds to the power supply system of the present invention. Further, the power supply system 2 according to the fourth embodiment is configured by specifically applying the connection method of the present invention. Further, the power supply system 2 includes the configuration described as the full-load distribution board 100 in the power supply system 1 as a power supply path 130 that is not limited to a distribution board. The power supply path 130 may be a single device or may be composed of a plurality of devices, and does not need to have a specific device configuration, but can have an appropriate configuration.

In FIG. 6, the commercial power system 10 is connected to a power line 101 via a system connection part CP, and further connected to a contact 110a of an automatic switching device 110 through the power line 101. A power line 106 connected to the household load 11 is connected to the contact 110c of the automatic switch 110. Further, the power supply system 2 includes a storage battery/solar power generation hybrid system 301 instead of the independent storage battery system 300 and the solar power generation system 200.

The storage battery/solar power generation hybrid system 301 includes a hybrid power conditioner 330 that has a function of controlling charging and discharging of the storage battery unit 310 and power generation by the PV panel 210. In the storage battery/solar power generation hybrid system 301, DC power generated by the PV panel 210 is input to the PV unit 230 through the power line 211. The input DC power is converted into a predetermined DC voltage in the PV unit 230 and input to the hybrid power conditioner 330 via the power line 213. The DC power input from the PV unit 230 is converted to AC power and output to the power line 107. Further, the DC power input from the PV unit 230 is transformed to a predetermined voltage and is supplied to charge the storage battery unit 310 through the power line 311. DC power discharged from storage battery unit 310 is input to hybrid power conditioner 330 via power line 311, converted to a predetermined voltage, further converted to AC power, and output to power line 107. Power line 107 is connected to electric circuit 101 at connection portion CP2. Furthermore, in the hybrid power conditioner 330, AC power converted from DC power input from the storage battery unit 310 or the PV unit 230 is output to the transformer unit 340 via the power line 312. The AC power input to the transformer unit 340 is transformed to a predetermined voltage by the transformer unit 340 and output to the power line 108 . Power line 108 is connected to contact 110b of automatic switch 110. Although this embodiment shows an example in which the PV unit 230 is separate from the hybrid power conditioner 330, the hybrid power conditioner 330 may have the functions of the PV unit built-in. The built-in hybrid power conditioner 330 has a configuration in which the DC power power line 211 of the PV panel 210 is directly connected.
Here, the storage battery/solar power generation hybrid system 301 corresponds to the distributed power source of the present invention. Moreover, the power line 107 corresponds to the input power line of the present invention. Further, the power line 108 corresponds to a power line during a power outage according to the present invention.

Current transformer CT1 is provided on the upstream side of connection portion CP2 of electric line 101, and the detection output of current transformer CT1 is input to hybrid power conditioner 330 through signal line DL1. A connection point CP3 that connects a power line 105 to which AC power generated by the fuel cell cogeneration system 500 is supplied is provided in the electric line 101 on the downstream side of the connection part CP2 and on the upstream side of the automatic switching device 110. A current transformer CT2 is provided in the electrical path 101 between the connection portion CP2 and the connection portion CP3, that is, at a position downstream of the connection portion CP2 and upstream of the connection portion CP3. The detection output of the current transformer CT2 is input to the fuel cell cogeneration system 500 through a signal line DL2 connected to the fuel cell cogeneration system 500.

In the storage battery/solar power generation hybrid system 301, when voltage is detected at the power conditioner connection part of the power line 107, it is normal, that is, the power supply from the commercial power system 10 continues normally without stopping. I judge that. When it is determined that the time is normal, the storage battery/solar power generation hybrid system 301 outputs AC power through the power line 107 as described above, and connects it to the household load through the connection part CP2 and the automatic switching device 110. 11 or input AC power through the power line 107 to charge the storage battery unit 310.

If no voltage is detected at the power conditioner connection part of the power line 107, the hybrid power conditioner 330 of the storage battery/solar power generation hybrid system 301 has stopped supplying power from the commercial power system 10, that is. It is determined that there is a power outage, and the output of AC power through the power line 107 is stopped. Therefore, the supply of AC power from the storage battery/solar power generation hybrid system 301 to the electric line 101 via the connection part CP2 is stopped. Furthermore, when the hybrid power conditioner 330 of the storage battery/solar power generation hybrid system 301 determines that there is a power outage, it outputs AC power to the transformer unit 340 through the power line 312, and outputs the AC power as a self-sustaining output through the transformer unit 340. Output to power line 108.

In the fuel cell cogeneration system 500, the current flowing through the electric line 101 is detected by the current transformer CT2. A current supplied from the commercial power system 10 and the storage battery/solar power generation hybrid system 301 flows through the electric line 101 at a position between the connection part CP2 and the connection part CP3 where the current transformer CT1 is provided. That is, the amount of power consumed by the household load 11 excluding the amount supplied by the fuel cell cogeneration system 500 is detected by the current transformer CT2.
When the fuel cell cogeneration system 500 detects that the voltage at the connection point of the power line 105 connected to the commercial power system 10 is normal, the fuel cell cogeneration system 500 performs normal operation, that is, without stopping the power supply from the commercial power system 10. It is determined that it is continuing normally. At this time, the fuel cell cogeneration system 500 outputs AC power through the power line 105 and supplies the AC power to the domestic load 11 via the connection part CP3 and the automatic switch 110 (normal operation mode).

Furthermore, the fuel cell cogeneration system 500 can include the islanding detection function described in the first embodiment. According to this islanding detection function, since the power supply from the commercial power system 10 is not stopped during normal times, it is determined that there is "no abnormality", that is, there is no islanding state.

If the fuel cell cogeneration system 500 detects that the voltage at the connection point of the power line 105 connected to the commercial power system 10 is normal, it determines that a power outage has occurred, switches to the self-sustaining mode, and disconnects the AC power through the power line 105. The output is stopped, and AC power is output as a self-sustaining output through the power line 14 connected to the specific load outlet 13, and AC power is supplied to the load connected to the specific load outlet 13. Note that during independent operation, independent operation detection is not performed. In other words, the fuel cell cogeneration system 500 does not perform a method of detecting whether the commercial power system 10 is normal during a power outage.

As described above, when the power supply from the commercial power system 10 is stopped, the solar power generation system 200, the storage battery/solar power generation hybrid system 301, and the fuel cell cogeneration system are connected to the electric line 101 connected to the commercial power system 10. Since power supply from any of the switches 500 is stopped, no voltage is generated at the contact 110a of the automatic switch 110. On the other hand, since a voltage appears at the contact 110b due to the power line 108 connected to the transformer unit 340 of the storage battery/solar power generation hybrid system 301, the automatic switch 110 changes the contact 110c and the contact 110b from the state shown in FIG. Switched to connect.

When the power is restored from the power outage and power supply from the commercial power system 10 is started, the current transformer CT1 detects the current flowing through the power line 101, and the storage battery/solar power generation hybrid system 301 determines that it is normal and connects the power line to the power line. The self-sustaining operation output from 108 is stopped. In the automatic switch 110, since no voltage appears at the contact 110b and a voltage is generated at the contact 110a, the contact 110b is switched to the contact 110a, and the contact 110c and the contact 110a are connected. When the current transformer CT2 detects that current flows through the power line 101, the fuel cell cogeneration system 500 determines that it has returned to normal operation, generates electricity using the current detected by the current transformer CT2, and transmits the current through the power line 105. AC power is output and power is supplied to the household load 11 via the connection part CP3, the automatic switch 110, and the main distribution board 400.

In this manner, according to the power supply system 2, even during a power outage, the fuel cell cogeneration system 500 and the storage battery/solar power generation hybrid system 301 can each appropriately perform independent operation.

[Example 5]
FIG. 7 is a diagram showing a schematic configuration of a hybrid power conditioner 700 according to the fifth embodiment. In Fig. 7, each electrical circuit and power line is shown as a single line, but in reality, the electrical circuit and power line through which alternating current flows actually have three lines for each phase: U phase, O phase, and W phase. The electric circuit and power line, which is composed of an electric circuit and a power line, and through which a direct current flows, is composed of two electric circuits and a power line.
Hybrid power conditioner 700 has a function of controlling charging and discharging of storage battery unit 310 and power generation of PV panel 210. Further, the hybrid power conditioner 700 includes a connection part for the commercial power system 10, a fuel cell cogeneration system 500, and a connection part for the domestic load 11, as described later.
Here, hybrid power conditioner 700 corresponds to the power conversion device of the present invention. Further, a hybrid power conditioner 700 according to the fifth embodiment is configured by specifically applying the connection method of the present invention.

The hybrid power conditioner 700 first includes a power conversion section 710 including a control section 711 , an input section 712 , a transformer section 713 , an input/output section 714 , a conversion section 715 , an input/output section 716 , and a switch 703 .
The control unit 711 controls charging and discharging of the storage battery unit 310 and power generation of the PV panel 210 by controlling each unit such as the input unit 712 described above. A detection output from a current transformer CT21 that detects a current flowing through a power line connected to the commercial power system 10 is input to the control unit 711 through a signal line DL21. The control unit 711 also controls a switch 703, which will be described later, depending on whether it is normal or during a power outage. Although not shown, the electric line 701 of the power supply line 720 is connected upstream to the commercial power system 10 side, and the control unit 711 monitors the voltage of the electric line 701 to prevent power outages during normal operation of the commercial power system 10. The time may also be detected.
In hybrid power conditioner 700, DC power generated by PV panel 210 is input to PV unit 230 via power line 211. The input DC power is converted into a predetermined DC voltage in the PV unit 230 and input to the input section 712 of the hybrid power conditioner 700 via the power line 213. The DC power input from the PV unit 230 is converted into AC power by the conversion section 715 and output from the input/output section 716 to the electric line 706. Further, the DC power input from the PV unit 230 to the input section 712 is transformed to a predetermined voltage in the transformer section 713, and is supplied from the input/output section 714 through the power line 311 to charge the storage battery unit 310. The DC power discharged from the storage battery unit 310 is input to the input/output section 714, converted to a predetermined voltage at the transformation section 713, further converted to AC power at the conversion section 715, and then transmitted from the input/output section 716 to the power line 107. Output. Electrical line 706 is connected to contact 703c of switch 703.
Here, the power converter 710 corresponds to the power converter of the present invention. Further, the input/output section 716 corresponds to the output section of the present invention. Further, the switch 703 corresponds to a first switch of the present invention. Contact 703c corresponds to the first terminal of the present invention.

The hybrid power conditioner 700 further includes a power supply path 720 that connects the PV unit 230, the storage battery unit 310, the commercial power system 10, the fuel cell cogeneration system 500, and the domestic load 11. Although this embodiment shows an example in which the PV unit 230 is separate from the hybrid power conditioner 700, the hybrid power conditioner 700 may have the functions of the PV unit built-in. If the built-in hybrid power conditioner 700 is used, the configuration is such that the DC power power line 211 of the PV panel 210 is directly connected.
Here, the power supply path 720 corresponds to the power supply path of the present invention.

The power supply path 720 of the hybrid power conditioner 700 includes a grid connection part CP21 to which the commercial power grid 10 is connected, an automatic switch 702 connected to the domestic load 11, a first connection part CP21 and the automatic switch 702. A power line 105 to which electric power generated by the fuel cell cogeneration system 500 is output is connected via an electric line 708 to a fuel cell cogeneration system connection part CP24, which outputs electric power to the domestic load 11. A load connection portion CP25 to which the power line 106 is connected via an electric path 709 is provided. In the following description, the commercial power system 10 side will be referred to as upstream, and the domestic load 11 side will be referred to as downstream.
Here, the system connection part CP21 corresponds to the system connection part of the present invention. Further, the automatic switch 702 corresponds to a switch and a second switch of the present invention. Moreover, the electric path 701 corresponds to the first electric path of the present invention. Further, the fuel cell cogeneration system connection section CP24 corresponds to the power supply device connection section of the present invention. Moreover, the load connection part CP25 corresponds to the load connection part of the present invention. Moreover, the power line 106 (and the electric line 709) corresponds to the load output line of the present invention.

On the way to the automatic switch 702 on the electric line 701 of the power supply line 720, a solar power generation/storage battery connection part CP22 is provided to which an electric line 704 connecting the electric line 701 and the switch 703 is connected. Also, on the electric line 701 of the power supply path 720, between the solar power generation/storage battery connection part CP22 and the automatic switch 702, that is, downstream of the solar power generation/storage battery connection part CP22 and upstream of the automatic switch 702. At the position, there is a fuel cell cogeneration system connection part CP23 to which the power line 105 for supplying the electric power generated by the fuel cell cogeneration system 500 is connected via the fuel cell cogeneration system connection part CP24 and the electric line 708. It is provided. Also, between the solar power generation/storage battery connection part CP22 and the fuel cell cogeneration system connection part CP23 on the electric line 701 of the power supply path 720, that is, downstream of the solar power generation/storage battery connection part CP22, and the fuel cell cord A detection unit installation area Ar21 for installing a current transformer CT2 for detecting the current flowing in the electric line 701 is provided at a position upstream of the generation system connection part CP23. The current transformer CT2 installed in the detection unit installation area Ar21 is connected to the fuel cell cogeneration system 500 by a signal line DL2, and the detection output of the current transformer CT2 is input to the fuel cell cogeneration system 500. In FIG. 7, a case is explained where the current transformer CT21 is provided outside the hybrid power conditioner 700, but between the grid connection part CP21 and the solar power generation/storage battery connection part CP22, that is, A detection unit installation area Ar22 may be provided downstream and upstream of the solar power generation/storage battery connection part CP22, and the current transformer CT21 may be provided in this detection unit installation area Ar22.
Here, the solar power generation/storage battery connection part CP22 corresponds to the first connection part in the present invention. The fuel cell cogeneration system connection part CP23 corresponds to the second connection part of the present invention. The current transformer CT2 and the detection unit installation area Ar21 correspond to the first current detector (or specific current detector) and the second current detector installation area (or specific current detector installation area) of the present invention, respectively. Current transformer CT21 corresponds to the first current detector of the present invention. Further, the electric line 704 corresponds to the distributed power source normal electric line and input power line of the present invention. Further, the power line 105 corresponds to the normal output line and the specific power line of the present invention.

The automatic switching device 702 has a contact 702c to which the power line 104 that supplies AC power to the domestic load 11 is connected via the load connection part CP25 and the electric line 709, a contact 702a to which the electric line 701 is connected, and an input/output part 716. and a contact 702b to which an electric line 705 to which AC power is output as a self-sustaining output is connected, and the contact 702c is switched and connected to either the contact 702a or the contact 702b. The automatic switch 702 is basically switched to the contact 702a or the contact 702b which is generating voltage, and is connected to the contact 702c. In this embodiment, the automatic switch 702 may be configured to switch "automatically", or may be configured such that switching is controlled by an instruction from the control unit 711, for example.
Here, contact 702a, contact 702b, and contact 702c correspond to the first input terminal, second input terminal, and output terminal of the present invention, respectively. Further, the electric line 705 corresponds to the electric line at the time of power outage of the distributed power supply according to the present invention. Further, the contact 702a and the contact 702b correspond to two contacts (or input side) of the present invention. Further, the contact 702a and the contact 702b correspond to one contact (or input side) and the other contact (input side) of the present invention, respectively. Further, the contact 702c corresponds to the output side of the present invention.

The switch 703 is connected to a contact 703c to which the electric line 706 connected to the input/output unit 716 is connected, a contact 703a to which the electric line 704 is connected, and an electric line 705 connected to the contact 702b of the automatic switch 702. It has a contact point 703c. The control unit 711 determines that it is normal and instructs the switch 703 to connect the contact 703c and the contact 703a. When the current detected by the current transformer CT21 is "no" (the detected value is 0), the control unit 711 determines that there is a power outage, and the switch 703 connects the contacts 703c and 703b. instruct them to do so.
Here, contact 703a and contact 703b correspond to the second terminal and third terminal of the present invention, respectively.

Normally, the contact 703c and the contact 703a are connected in the switch 703, so the input/output section 716 and the solar power generation/storage battery connection section CP22 are connected via the electric line 706, the switch 703, and the electric line 704. Ru. As a result, the power discharged from the storage battery unit 310 and the power generated by the PV panel 210 are supplied to the domestic load 11 via the electric line 701, the automatic switch 702, and the power line 104, or are supplied to the domestic load 11 via the electric line 701 to the commercial It is output to the power grid 10.

During a power outage, contacts 703c and 703b are connected in the switch 703, so the input/output section 716 and the electric line 705 are connected via the electric line 706, the switch 703, and the electric line 705. During a power outage, the power supply from the commercial power system 10 is stopped, the power supply from the storage battery unit 310 and the PV panel 210 via the solar power generation/storage battery connection part CP22 is stopped, and the fuel cell cogeneration system connection part CP23 is stopped. The power supply from the fuel cell cogeneration system 500 via the fuel cell cogeneration system 500 is also stopped, and no voltage appears on the electric line 701. On the other hand, since the switch 703 is switched and the contacts 703c and 703b are connected, AC power is output from the input/output section 716 as a self-sustaining output to the electric line 705, and voltage is applied to the contact 702b of the automatic switch 702. appear. Therefore, as shown in FIG. 6, the automatic switch 702 switches from the state where the contacts 702c and 702a are connected, and the contacts 702c and 702b are connected. In this way, in the event of a power outage, power is supplied from the storage battery unit 310 and the PV panel 210 to the household load 11. At this time, the fuel cell cogeneration system 500 outputs AC power from the generated power to the power line connected to the specific load outlet 13 as a self-sustaining output instead of outputting it to the fuel cell cogeneration system connection part CP23. , supplies AC power to the load connected to the specific load outlet 13.
In this embodiment, a hybrid power conditioner that connects and controls the storage battery unit 310 and the PV panel 210 is illustrated, but a storage battery power conditioner that exclusively connects only the storage battery unit 310, It is also possible to implement an embodiment in which only the PV panel 210 is replaced with a PV power conditioner to which it is exclusively connected. In the case of a storage battery power conditioner, there is no input section 712, and in the case of a PV power conditioner, there is no transformer section 713 and input/output section 714. Even if it is not a hybrid but a storage battery power conditioner or a PV power conditioner, the configuration of the power supply path 720 is the same, and includes the control section 711 of the power conversion section 710, the conversion section 715, the input/output section 716, The function of the switch 703 also has a substantially similar configuration.

<Additional note 1>
a distributed power source (200, 300) having an independent operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
a power supply device (500) having a standalone operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
a full-load distribution board (100) that supplies power supplied from the commercial power system (10), the distributed power source (200, 300), and the power supply device (500) to a load;
An electric power supply system (1) comprising:
The full load distribution board (100) is
A first input terminal (110a) into which electric power supplied from the commercial power system (10) is input, and a second input terminal (110b) into which the self-sustaining output from the distributed power source (200, 300) is input. and an output terminal (110c) from which power to be supplied to the load (11) is output, and the output terminal is switched between the first input terminal (110a) and the second input terminal (110b). a switch (110) connected to (110c);
a grid connection part (CP) to which the commercial power grid (10) is connected;
a first electric path (101) connecting the system connection part (CP) and the first input terminal (110a);
A first connection section (CP1, CP1, CP2) and
The power supply device (500) is provided on the first electric path (101) between the first connection portion (CP1, CP2) and the switch (110), and the power supply device (500) is connected to the power supply device (500). 500) into which the normal operation output is input;
The distributed power source (200) detects the current supplied from the commercial power system (10) to the first electric line (101), and controls the distributed power source (200, 300) based on the detection result. , 300);
Detecting the current flowing through the first electric path (101) connecting the first connection part (CP1, CP2) and the second connection part (CP3), and controlling the power supply device (500) based on the detection result. a second current detector (CT2) connected to the power supply device (500) to control the
An electric power supply system (1) characterized by comprising:

<Additional note 2>
A first input terminal (610a) to which power supplied from the commercial power system (10) is input, and a second input terminal to which the self-sustaining output at the time of a power outage of the commercial power system is input from the distributed power source (200, 300). It has an input terminal (610b) and an output terminal (610c) from which power to be supplied to the load (11) is output, and switches between the first input terminal (610a) and the second input terminal (610b). a switch (610) connected to the output terminal (610c);
a system connection part (CP61) to which the commercial power system is connected;
a first electric path (601) connecting the system connection part (CP61) and the first input terminal (610a);
a first connection part (CP62) provided on the first electrical path (601), to which the distributed power source (200, 300) is connected, and to which the normal operation output is input from the distributed power source (200, 300); and,
It is provided between the first connection part (CP62) and the switching device (610) on the first electric line (601), and is configured to output a standalone operation output during a power outage and a normal operation output of the commercial power system (10). a second connection part (CP63) to which a power supply device (500) having a normal operation output is connected, and into which the normal operation output is input from the power supply device (500);
Connected to the distributed power source (200, 300) in order to detect the current supplied from the commercial power system (10) to the first electric line (601) and control the distributed power source based on the detection result. a first current detector installation area (Ar1) in which a first current detector (CT1) is installed;
Detecting a current flowing through the first electric path (601) connecting the first connection part (CP62) and the second connection part (CP63), and controlling the power supply device (500) based on the detection result. a second current detector installation area (Ar2) in which a second current detector (CT2) connected to the power supply device (500) is installed;
A full load distribution board (600) characterized by comprising:

<Additional note 3>
A first input terminal (610a) to which power supplied from the commercial power system (10) is input, and a second input terminal to which the self-sustaining output at the time of a power outage of the commercial power system is input from the distributed power source (200, 300). It has an input terminal (610b) and an output terminal (610c) from which power to be supplied to the load (11) is output, and switches between the first input terminal (610a) and the second input terminal (610b). a switch (610) connected to the output terminal (610c);
a grid connection part (CP61) to which the commercial power grid is connected;
a first electric path (601) connecting the system connection part (CP61) and the first input terminal (610a);
a first connection part (CP62) provided on the first electrical path (601), to which the distributed power source (200, 300) is connected, and to which the normal operation output is input from the distributed power source (200, 300); and,
It is provided between the first connection part (CP62) and the switching device (610) on the first electric line (601), and is configured to output a standalone operation output during a power outage and a normal operation output of the commercial power system (10). a second connection part (CP63) to which a power supply device (500) having a normal operation output is connected, and into which the normal operation output is input from the power supply device (500);
A full load distribution board (600) characterized by comprising:

<Additional note 4>
A first input terminal (610a) to which power supplied from the commercial power system (10) is input, and a second input terminal to which the self-sustaining output at the time of a power outage of the commercial power system is input from the distributed power source (200, 300). It has an input terminal (610b) and an output terminal (610c) from which power to be supplied to the load (11) is output, and switches between the first input terminal (610a) and the second input terminal (610b). a switch (610) connected to the output terminal (610c);
a system connection part (CP61) to which the commercial power system is connected;
a first electric path (601) connecting the system connection part (CP61) and the first input terminal (610a);
a first connection part (CP62) provided on the first electrical path (601), to which the distributed power source (200, 300) is connected, and to which the normal operation output is input from the distributed power source (200, 300); and,
It is provided between the first connection part (CP62) and the switching device (610) on the first electric line (601), and is configured to output a standalone operation output during a power outage and a normal operation output of the commercial power system (10). a second connection part (CP63) to which a power supply device (500) having a normal operation output is connected, and into which the normal operation output is input from the power supply device (500);
Detecting a current flowing through the first electric path (601) connecting the first connection part (CP62) and the second connection part (CP63), and controlling the power supply device (500) based on the detection result. a second current detector installation area (Ar2) in which a second current detector (CT2) connected to the power supply device (500) is installed;
A full load distribution board (600) characterized by comprising:

<Additional note 5>
a distributed power source (200, 300) having an independent operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
A first input terminal (110a) to which power supplied from the commercial power system (10) is input, a second input terminal (110b) to which the self-sustaining output from the distributed power source (200, 300) is input, a load ( 11) has an output terminal (110c) from which the power supplied to the device is output, and switches the first input terminal (110a) and the second input terminal (110b) to connect to the output terminal (110c). a first electrical circuit ( 101), and a first connection section provided on the first electrical path (101), to which the distributed power source (200, 300) is connected, and into which the normal operation output is input from the distributed power source (200, 300). (CP1, CP2) and the current supplied from the commercial power system (10) to the first electric line (101), and control the distributed power source (200, 300) based on the detection result. a first current detector (CT1) connected to the distributed power source (200, 300);
A power supply device (500) used in a power supply system (1) comprising:
It has an independent operation output during a power outage of the commercial power system (10) and a normal operation output during normal times,
It is connected to a second connection part (CP3) provided between the first connection parts (CP1, CP2) and the switching device (11) on the first electric path (101), and outputs the normal operation output. a normal output section (521) that outputs;
a power outage output unit (522) that outputs the self-sustaining output during a power outage;
A detection result input from a second current detector (CT2) that detects the current flowing through the first electric path (101) connecting the first connection part (CP1, CP2) and the second connection part (CP3). a control unit (510) that controls the normal output unit (521) and the power outage output unit (522) based on;
A power supply device (500) comprising:

<Additional note 6>
a distributed power source (200, 300) having an independent operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
A first input terminal (110a) to which power supplied from the commercial power system (10) is input, a second input terminal (110b) to which the self-sustaining output from the distributed power source (200, 300) is input, a load ( 11) has an output terminal (110c) from which the power supplied to the device is output, and switches the first input terminal (110a) and the second input terminal (110b) to connect to the output terminal (110c). a first electrical circuit ( 101), and a first connection section provided on the first electrical path (101), to which the distributed power source (200, 300) is connected, and into which the normal operation output is input from the distributed power source (200, 300). (CP1, CP2) and a first current that is a current supplied from the commercial power system (10) to the first electric line (101), and based on the detection result, the distributed power source (200, 300 ); a full load distribution board (100) comprising a first current detector (CT1) connected to the distributed power source (200, 300) to control the distributed power source (CT1);
A power supply control method for a power supply device (500) used in a power supply system (1) comprising:
The power supply device (500) has an independent operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation,
The first connection part (CP1, CP2) is provided on the first electric circuit (10), the power supply device (500) is connected, and the normal operation output is input from the power supply device (500). detecting a second current that is a current flowing through the first electric path (101) connecting the second connection part (CP3);
When the second current is detected, a second connection part ( CP3) supplying AC power to the load (11);
a step of performing islanding detection;
a step of determining that the vehicle is not operating alone;
If the second current is not detected, supplying the self-sustaining output to a specific load (14) connected to a specific load outlet (13) connected to the power supply device (500);
A power supply control method for a power supply device (500), comprising:

<Additional note 7>
a distributed power source (301) having a standalone operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
a power supply device (500) having a standalone operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation;
a power supply path (130) that supplies power supplied from the commercial power system (10), the distributed power source (301), and the power supply device (500) to a load;
An electric power supply system (2) comprising:
The power supply path (130) is
a first input terminal (110a) into which electric power supplied from the commercial power system (10) is input; and a second input terminal (110b) into which the self-sustaining output from the distributed power source (301) is input; an output terminal (110c) from which the power supplied to the load (11) is output, and the output terminal (110c) is switched between the first input terminal (110a) and the second input terminal (110b). ) a switching device (110) connected to the
a grid connection part (CP) to which the commercial power grid (10) is connected;
a first electric path (101) connecting the system connection part (CP) and the first input terminal (110a);
a first connection part (CP2) provided on the first electrical path (101), to which the distributed power source (301) is connected, and to which the normal operation output is input from the distributed power source (301);
The power supply device (500) is provided on the first electric path (101) between the first connection portion (CP2) and the switch (110), and is connected to the power supply device (500). a second connection part (CP3) into which the normal operation output is input from;
to the distributed power source (301) in order to detect the current supplied to the first electric line (101) from the commercial power system (10) and control the distributed power source (301) based on the detection result. a first current detector (CT1) connected;
Detecting a current flowing through the first electric path (101) connecting the first connection part (CP2) and the second connection part (CP3), and controlling the power supply device (500) based on the detection result. a second current detector (CT2) connected to the power supply device (500) to
An electric power supply system (2) characterized by comprising:

<Additional note 8>
A first input terminal (110a) to which power supplied from the commercial power system (10) is input, and a first input terminal (110a) to which the self-sustaining output at the time of a power outage of the commercial power system (10) is input from the distributed power source (301). It has two input terminals (110b) and an output terminal (110c) from which power to be supplied to the load (11) is output, and the first input terminal (110a) and the second input terminal (110b) are connected to each other. a switch (110) that switches and connects to the output terminal (110c);
a grid connection part (CP) to which the commercial power grid (10) is connected;
a first electrical path (101) connecting the system connection part (CP) and the first input terminal (110a);
a first connection part (CP2) provided on the first electrical path (101), to which the distributed power source (301) is connected, and to which the normal operation output is input from the distributed power source (301);
It is provided between the first connection part (CP2) and the switching device (110) on the first electric line (101), and is configured to provide a self-sustaining output during a power outage of the commercial power system (10) and a normal operation output during normal times. a second connection part (CP3) to which a power supply device (500) having an operating output is connected, and into which the normal operating output is input from the power supply device (500);
A power supply path (130) characterized by comprising:

<Additional note 9>
A commercial power system (10), a distributed power source (210, 230, 310) having a standalone operation output during a power outage of the commercial power system (10) and a normal operation output during normal operation, and a power outage of the commercial power system (10) a power supply path (720) that supplies power supplied from a power supply device (500) having a self-sustaining output at a time and a normal operation output at a normal time to a load (11);
a power conversion unit (710) that converts DC power output from the distributed power source (210, 230, 310) into AC power;
A power conversion device (700) comprising:
The power conversion unit (710) includes:
an output unit (716) that outputs the AC power;
A first terminal (703c) connected to the output section (716), a second terminal (703a) connected to the first terminal in normal times, and a third terminal (703a) connected to the first terminal in the event of a power outage. 708b), and a first switch (703) that switches between the second terminal (703a) and the third terminal (708b) and connects to the first terminal (708c);
a control unit (711) that controls the power conversion unit based on a detection result of a first current detector (CT1) that detects the current supplied from the commercial power system (10) to the power supply path (720); ,
Equipped with
The power supply path (720) is
The first input terminal (702a) into which electric power supplied from the commercial power system (10) is input, and the third terminal (703b) of the first switch (703) are connected to the output section (716). ), the second input terminal (702b) receives the self-sustaining output from the load (11), and the output terminal (702c) outputs the power supplied to the load (11). 702a) and the second input terminal (702b) to connect to the output terminal (702c9);
a grid connection part (CP21) to which the commercial power grid (10) is connected;
a first electric path (701) connecting the system connection part (CP21) and the first input terminal (702a);
a first connection part (CP22) provided on the first electric path (701) and connected to the second terminal (703a) of the first switch (703);
It is provided between the first connection part (CP22) and the second switching device (702) on the first electrical path (701), to which the power supply device (500) is connected, and the power supply device (500) is connected to the power supply device (500). 500) into which the normal operation output is input;
Detecting a current flowing through the first electric path (701) connecting the first connection part (CP22) and the second connection part (CP23), and controlling the power supply device (500) based on the detection result. a second current detector installation area (Ar2) in which a second current detector (CT2) connected to the power supply device (500) is installed;
A power conversion device (700) characterized by comprising:

<Additional Note 10>
A power conversion device (700) having a power supply path (720),
The power supply path (720) includes a grid connection part (CP21) that connects the commercial power system (10), and a power supply line (CP21) that connects the commercial power system (10) with power from the distributed power sources (210, 230, 310) during normal times. A distributed power supply normal line (704) for supplying a distributed power supply, and a distributed power supply power failure line (705) for supplying power from the distributed power supply (210, 230, 310) during a power outage of the commercial power system (10). , a load connection part (CP25) that outputs power to the load (11), and two contacts (7
02a, 702b) to connect to the output side (702c),
The switching device (702) connects one of the contacts (702a) to the first electric line (701) connected to the system connection part (CP21) and the distributed power supply normal electric line (704), and the other The distributed power supply power failure circuit (705) is connected to the contact point (702b) of the power supply, and the load connection part (CP25) is connected to the output side (702c).
The power supply path (720) includes a first connection portion (CP22) that connects the distributed power supply normal power path (704) to the first power path (701), and a connection between the first connection portion (CP22) and the switch. A power conversion device (700) characterized in that it has a second connection portion (CP23) for connecting a normal output line (105) of a power supply device (500) between the power supply device (702).

<Additional note 11>
A connection method in a power conversion device (700) having a power supply path (720), comprising:
In the power supply path (720), a first electric path (701) connected to the commercial power system (10) and power from the distributed power sources (210, 230, 310) during normal times of the commercial power system (10) a distributed power supply normal line (704) that supplies power, and a distributed power outage line (705) that supplies power from the distributed power source (210, 230, 310) during a power outage of the commercial power system (10). , a load output line (106) from which the power supplied to the load (11) is output, and a switch (702) that switches to one of the two contacts (702a, 702b) and connects to the output side (702c9). Connect with
The first electrical circuit (701) and the distributed power supply normal electrical circuit (704) are connected to one contact (702a) of the two contacts (702a, 702b) of the switch (702), and the other contact (702b) is connected to the distributed power supply power outage line (705), and the output side (702c) is connected to the load output line (106);
The distributed power source normal power line (704) is connected to the first connection part (CP22) in the middle of the first line (701), and the first connection part (CP22) of the first line (701) is connected to the first connection part (CP22) of the first line (701). A normal output line (105) through which power supplied from the power supply device (500) is output is connected to the second connection portion (CP23) between the switching device (702). Connection method.

<Additional note 12>
A first electric line (101) that inputs power from the commercial power system (10), and an input power line (102, 103) that inputs power from the distributed power source (200, 300) during normal times of the commercial power system (10). , a power outage line (120) that inputs power from the distributed power source (200, 300) during a power outage in the commercial power system (10), and an output power line (104) that outputs power to the load (11). , a specific power line (105) that inputs power from the power supply device (500), and a switch that switches to one of the two input sides (110a, 110b) and connects it to the output side (110c). (110),
The first electric circuit (101) and the input power line (102, 103) are connected to one input side (110a) of the switch (110), and a power outage line (120) is connected to the other input side (110b). ) and connect the output power line (1049) to the output side (110c),
The input power lines (102, 103) are connected to the first electric path (101) at first connection parts (CP1, CP2) on the way to the switch (110), and the first connection part (CP1 ) to the switch (110), the specific power line (105) is connected to a second connection part (CP3) on the way from the switching device (110).

10 Commercial power system 100 Full load distribution board 101 First electrical circuit 110 Automatic switch 110a First input terminal 110b Second input terminal 110c Output terminal 200 Solar power generation system 300 Storage battery system 500 Fuel cell cogeneration system 500
CP System connection part CP1 Connection part CP2 Connection part CP3 Second connection part CT1 First current detector CT2 Second current detector

Claims (15)

A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
a power supply device having a standalone operation output during a power outage of the commercial power system and a normal operation output during normal operation;
a full-load distribution board that supplies power supplied from the commercial power system, the distributed power source, and the power supply device to loads;
An electric power supply system comprising:
The full load distribution board is
a first input terminal into which the power supplied from the commercial power system is input; a second input terminal into which the self-sustaining output from the distributed power source is input; and an output from which the power supplied to the load is output. a terminal, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
a second connection part provided between the first connection part and the switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied to the first electric line from the commercial power system and controlling the distributed power source based on the detection result;
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. 2 current detectors;
A power supply system characterized by comprising: A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection part and the switching device on the first electric power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied from the commercial power system to the first electric line and controlling the distributed power source based on the detection result; 1 current detector installation area,
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
A full load distribution board characterized by being equipped with. A first input terminal to which power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection portion and the switching device on the first electrical power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
A full load distribution board characterized by being equipped with. A first input terminal to which power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection portion and the switching device on the first electrical power line, and has an independent operation output during a power outage of the commercial power system and a normal operation output during normal operation, a second connection portion into which the normal operation output is input from the power supply device;
A first electrical circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
A full load distribution board characterized by being equipped with. A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
It has a first input terminal into which power supplied from the commercial power system is input, a second input terminal into which the self-sustaining output is input from the distributed power source, and an output terminal from which the power supplied to the load is output, A switching device that switches the first input terminal and the second input terminal and connects them to the output terminal, a system connection part to which the commercial power system is connected, the system connection part, and the first input terminal. a first electrical circuit to be connected; a first connection section provided on the first electrical circuit, to which the distributed power source is connected and to which a normal operation output is input from the distributed power source; a first current detector connected to the distributed power source for detecting the current supplied to the electrical circuit and controlling the distributed power source based on the detection result;
A power supply device used in a power supply system including:
It has an independent operation output during a power outage in the commercial power system and a normal operation output during normal times,
a normal output section connected to a second connection section provided between the first connection section and the switching device on the first electrical circuit, and outputting the normal operation output;
a power outage output unit that outputs the self-sustaining output during a power outage;
Based on the detection result input from the second current detector that detects the current flowing through the first electric path connecting the first connection part and the second connection part, the normal output part and the power outage output part a control section that controls the section;
A power supply device characterized by comprising: A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
It has a first input terminal into which power supplied from the commercial power system is input, a second input terminal into which the self-sustaining output is input from the distributed power source, and an output terminal from which the power supplied to the load is output, A switching device that switches the first input terminal and the second input terminal and connects them to the output terminal, a system connection part to which the commercial power system is connected, the system connection part, and the first input terminal. a first electrical circuit to be connected; a first connection section provided on the first electrical circuit, to which the distributed power source is connected and to which a normal operation output is input from the distributed power source; a first current detector connected to the distributed power source for detecting a first current that is a current supplied to an electric circuit and controlling the distributed power source based on the detection result; Electric board and
A power supply control method for a power supply device used in a power supply system including:
The power supply device has an independent operation output during a power outage of a commercial power system and a normal operation output during normal operation,
Flows through the first electrical path connecting the first connecting portion and a second connecting portion provided on the first electrical circuit, to which the power supply device is connected and to which normal operation output is input from the power supply device. detecting a second current that is an electric current;
supplying alternating current power to the load via a second connection provided between the first connection and the switch on the first electric current when the second current is detected; and,
a step of performing islanding detection;
a step of determining that the vehicle is not operating alone;
If the second current is not detected, supplying the self-sustaining output to a specific load connected to a specific load outlet connected to the power supply device;
A power supply control method for a power supply device, comprising: A distributed power source having a standalone operation output during a power outage in the commercial power system and a normal operation output during normal operation;
a power supply device having a self-sustaining output during a power outage in a commercial power system and a normal operating output during normal operation;
a power supply path that supplies power supplied from the commercial power system, the distributed power source, and the power supply device to a load;
An electric power supply system comprising:
The power supply path is
a first input terminal into which the power supplied from the commercial power system is input; a second input terminal into which the self-sustaining output from the distributed power source is input; and an output from which the power supplied to the load is output. a terminal, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which the normal operation output is input from the distributed power source;
a second connection part provided between the first connection part and the switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device;
a first current detector connected to the distributed power source for detecting a current supplied to the first electric line from the commercial power system and controlling the distributed power source based on the detection result;
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. 2 current detectors;
A power supply system characterized by comprising: A first input terminal to which electric power supplied from a commercial power system is input, a second input terminal to which an output of standalone operation at the time of a power outage of the commercial power system is input from a distributed power source, and a second input terminal to which electric power supplied to a load is input. an output terminal that outputs an output, and a switching device that switches the first input terminal and the second input terminal and connects them to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection section provided on the first electrical circuit, to which the distributed power source is connected, and into which a normal operation output is input from the distributed power source;
A power supply device is connected to the power supply device, which is provided between the first connection portion and the switching device on the first electrical power line, and has an independent operation output during a power outage of a commercial power system and a normal operation output during normal operation. a second connection portion into which the normal operation output is input from the power supply device;
A power supply path characterized by comprising: A commercial power system, a distributed power source having a self-sustaining output during a power outage in the commercial power system and a normal operating output during normal times, and a power supply having a self-sustaining output during a power outage and a normal operating output during normal times in the commercial power system. a power supply path that supplies power supplied from the device to a load;
a power conversion unit that converts DC power output from the distributed power source into AC power;
A power conversion device comprising:
The power conversion section includes:
an output unit that outputs the AC power;
A first terminal connected to the output section, a second terminal connected to the first terminal during normal times, and a third terminal connected to the first terminal during a power outage, the second terminal a first switch that switches between and the third terminal and connects the first terminal to the first terminal;
a control unit that controls the power conversion unit based on a detection result of a first current detector that detects a current supplied to the power supply path from the commercial power system;
Equipped with
The power supply path is
a first input terminal to which electric power supplied from the commercial power system is input; and a second input terminal connected to the third terminal of the first switching device and to which the self-sustaining output is input from the output section. , an output terminal from which the power supplied to the load is output, and a second switch that switches between the first input terminal and the second input terminal and connects the first input terminal and the second input terminal to the output terminal;
a grid connection part to which the commercial power grid is connected;
a first electrical path connecting the system connection part and the first input terminal;
a first connection part provided on the first electric circuit and connected to the second terminal of the first switch;
A second connection part provided between the first connection part and the second switching device on the first electrical circuit, to which the power supply device is connected, and into which the normal operation output is input from the power supply device. and,
A first circuit connected to the power supply device for detecting a current flowing through the first electric path connecting the first connection portion and the second connection portion and controlling the power supply device based on the detection result. a second current detector installation area in which the second current detector is installed;
A power conversion device characterized by comprising: A power conversion device having a power supply path,
The power supply path includes a grid connection section that connects the commercial power system, a distributed power supply normal line that supplies power from the distributed power source during normal times of the commercial power system, and a distributed power supply line that supplies power from the distributed power source during a power outage of the commercial power system. A distributed power supply power outage circuit that supplies power from a type power supply, a load connection part that outputs power to a load, and a switch that switches to one of two contacts and connects it to the output side,
The switching device connects a first electrical line connected to the system connection part and the distributed power supply normal circuit to one of the contacts, and connects the distributed power supply power outage circuit to the other contact. , connects the load connection part to the output side,
The power supply path connects a first connection part that connects the distributed power supply normal power line to the first power line, and a normal output line of the power supply device between the first connection part and the switch. A power conversion device characterized by having a second connection portion. A connection method in a power conversion device having a power supply path, the method comprising:
In the power supply line, a first electric line connected to the commercial power system, a distributed power supply normal line that supplies power from the distributed power source during normal times of the commercial electric power system, and a first electric line connected to the commercial power system during a power outage. A distributed power outage circuit that supplies power from the distributed power source, a load output line that outputs the power supplied to the load, and a switch that switches to one of the two contacts and connects it to the output side. connect,
The first electrical circuit and the distributed power supply normal circuit are connected to one of the two contacts of the switch, the distributed power supply power failure circuit is connected to the other contact, and the distributed power supply circuit is connected to the output side. Connect the load output line,
Connecting the distributed power source normal power line to a first connection part in the middle of the first power line, and supplying power to a second connection part of the first power line between the first connection part and the switching device. A connection method characterized in that a normal output line through which power supplied from the device is output is connected. A first electrical line that inputs power from the commercial power system, an input power line that inputs power from the distributed power source during normal times of the commercial power system, and an input power line that inputs power from the distributed power source during a power outage of the commercial power system. A power line during a power outage, an output power line that outputs power to the load, a specified power line that inputs power from the power supply device, and a switch that switches to one of the two input sides and connects it to the output side. A method of connecting,
Connecting the first electrical path and the input power line to one of the input sides of the switch, connecting a power outage line to the other input side, and connecting an output power line to the output side of the switch,
The input power line is connected to the first electrical path at a first connection part on the way to the switch, and the specific power line is connected to the second connection part on the way from the first connection part to the switch. A connection method characterized by connecting. By connecting the switching device to one of the input sides during the normal time, the power supplied to the load is supplied as combined power via the first electric path, the input power line, and the specific power line. is,
13. At the time of the power outage, by connecting the switching device to the other input side, the power supplied to the load is supplied as power via the power line at the time of power outage. Connection method. 14. The connection method according to claim 13, wherein during the power outage, the power supply device supplies the self-sustaining output through a specific load outlet. A specific current detector installation area for installing a specific current detector for the power supply device to detect current is provided between the first connection part and the second connection part. 15. The connection method according to any one of 12 to 14.

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